I was going to write a technical reply but my high schooler son just happened to summarize it in a great one liner:

"Mistral is so bad, it's the only AI my school doesn't bother to block"

I mean their latest model is gated behind API pricing that's more than enough to prevent any pupil from using it. I did not try ML4 (I'll wait till the end of the preview at least) so I can't tell anything about its performance outside of benchmarks, but on paper it's basically at the level of Muse Spark Open and I've not seen nearly as many people spitting on that model.